Considering the influence of the air on the velocity of flow, Volume of Fluids (VOF) method is used to track the free surface.

为考虑空气对水流流速的影响采用VOF方法追踪自由水面，并用施主—受主方法求解水体体积率控制方程。

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For incompressible fluids, both the mass flux and the volume flux are constant in a tube of flow.

对于不可压缩的流体来说，流管中的质量通量和体积通量都是恒定不变的。

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Hydrodynamics, the study of fluids in motion, is a subject about which multi-volume textbooks have been written.

流体动力学，研究流体的运动，是可以写成许多卷书的一门学科。

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With that stroke of his pen, Governor Perry made Texas the first state in the country to require by statute the well-by-well public disclosure of all the constituent chemicals, compounds and water volume contained in frac fluids.

FORBES: Why the Texas Disclosure Law Really Does Work